python - 解析转义字符

Question

使用 Python，我正在尝试解析这样的字符串:

"hello" "I am an example" "the man said:\"hello!\""

进入这些 token :

1) hello
2) I am an example
3) the man said: "hello!"

像 re.findall(r'"[^"]*"', str) 之类的东西很接近，但无法处理转义字符 (\)。我很好奇什么样的 pythonic有一些方法可以在不求助于 for 循环或大型解析器包的情况下处理转义字符。

Answer 1

这很适合正则表达式:

re.findall(r'"(?:\\.|[^"\\])*"', str)

解释:

"        # Match a "
(?:      # Match either...
 \\.     # an escaped character (\\, \" etc.)
|        # or
 [^"\\]  # any character except " or \
)*       # any number of times
"        # Match a "

这将正确处理转义的反斜杠:

>>> import re
>>> test = r'"hello" "Hello\\" "I am an example" "the man said:\"hello!\\\""'
>>> for match in re.findall(r'"(?:\\.|[^"\\])*"', test):
...     print(match)
...
"hello"
"Hello\\"
"I am an example"
"the man said:\"hello!\\\""